Medical authorities were baffled, both as to its causes and its virulence.
医疗当局对其病因及有多致命都还不甚了解。
If damp, musty buildings make you ill, mould is probably the cause.
如果潮湿发霉的建筑令你生病了，霉菌很可能是病因。
Smoking is a causative factor in several major diseases.
抽烟是引起几种严重疾病的病因。
The cause of autism is unknown.
自闭症的病因尚不清楚.
What brought on the illness is not clear.
病因未详.
Was the noise a cause of the illness, or were the complaints about noise merely a symptom?
噪音是病因呢, 还是对噪音的抱怨仅仅是一种症状 呢 ?
Although the causes of cancer are being uncovered, we do not yet have any practical way to prevent it.
虽然癌症的病因正被逐步揭开，但我们尚未有任何切实可行的办法来预防它。
Scientists think they have broken through in their attempt to find the causes of many major diseases.
科学家们认为,他们在探索主要病症的病因方面有了新的进展.
The doctor was able to treat the disease although he could not lay his finger on the exact cause.
医生能治这种病,不过他不能指出确切的病因.
The doctor was able to treat the disease although he could not put his finger on the exact cause.
医生能治这种病，不过他不能指出确切的病因。
It is generally thought that salt is a culprit in this disease.
一般认为食盐是这种病的病因.
The doctor excluded food poisoning as the cause of the illness.
医生排除了食物中毒的病因.
Recent research has shed new light on the causes of the disease.
最近的研究结果对该病的病因已有新的了解.
The doctors were unable assign a cause for her illness.
大夫们不能确定她的病因.
For renal disease, an etiologic relationship has not been established conclusively.
对于肾脏疾病, 却仍不能做出病因关系的结论.